Anth 220 Review Sheet for second exam

Anth 220 Review Sheet for second exam - Microevolution...

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Microevolution: evolution of populations over short periods of time because of observable causes Heterozygous: has different alleles, producing gametes of different genotypes; good because possess a selective advantage (homozygous is opposite) Forces of Evolution – causes population to be hetero or homo –zygous and not in equilibrium 1. natural selection – based on genes that best promote survival 2. gene flow – btwn two previously distinct groups can result in a third group that reflects genes from both parental groups; the more genetically distinct the initial groups were, the more dramatic the effects of gene flow will be 3. genetic drift – tendency for allele frequencies to change dramatically due to chance 4. mutation – dominant vs. recessive mutations; gene mutations produce changes in the DNA base sequence Speciation – splitting of one species into two or more species over time Types of selection 1. directional – mean of distribution is kept in a stable condition 2. balanced – selection against either high or low values; mean value changes over time in one direction
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This note was uploaded on 04/20/2008 for the course ANTH 220 taught by Professor Leslie during the Spring '08 term at Maryland.

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Anth 220 Review Sheet for second exam - Microevolution...

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